[Bug rtl-optimization/103632] New: wrong code at -O2 on aarch64-unknown-linux-gnu

[Bug rtl-optimization/103632] New: wrong code at -O2 on aarch64-unknown-linux-gnu

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103632

            Bug ID: 103632
           Summary: wrong code at -O2 on aarch64-unknown-linux-gnu
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: aarch64-unknown-linux-gnu

Created attachment 51960
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51960&action=edit
reduced testcase

Output:
$ aarch64-unknown-linux-gnu-gcc -O2 testcase.c -static
$ qemu-aarch64 -- ./a.out 
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted

$ aarch64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-5853-20211208233715-gaf93386ffc1-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-unknown-linux-gnu/12.0.0/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl
--with-sysroot=/usr/aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu
--with-ld=/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-5853-20211208233715-gaf93386ffc1-checking-yes-rtl-df-extra-aarch64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211209 (experimental) (GCC)

[Bug middle-end/103632] wrong code at -O2 on aarch64-unknown-linux-gnu

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103632

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |middle-end

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So if I add:
  asm("":"+w"(v128u32_2));
Right after the definition of v128u32_2, it works.
If I place it after:
  /* 0 */
  foo0_u16_0 ^= foo0_u64_0 % u128_0;

It fails.  The above uses a libcall to do the mod, so there could be some
scheduling or something like that.

[Bug middle-end/103632] wrong code at -O2 on aarch64-unknown-linux-gnu

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103632

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-12-09
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
I can only think this is some register allocation issue to some extend as the
upper bits of the SIMD registers can be clobbered by the function call.

[Bug middle-end/103632] wrong code at -O2 on aarch64-unknown-linux-gnu

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103632

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|NEW                         |RESOLVED

--- Comment #3 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
This is a dup of PR103350

*** This bug has been marked as a duplicate of bug 103350 ***